A single Design Property (in this example, "Plate -11") contains two separate input sets, Sizing and Analysis.
Sizing, which can be divided into three modes, involves optimizing the given design space, while Analysis is assessing margins of safety for a single design. Use the "Size" button to initiate sizing of the given Sizing inputs, and "Analyze" to run a margin assessment of the Analysis input.
Each input type can also be overridden - using the Sizing and Analysis Overrides tables, respectively.
Inputs can be "pushed" between Sizing and Analysis modes as needed.